Pendulum-balance



i on it, the poise being formed by cylinder in which it moves.

UNiTED STATES gPATENT onirica.

E. SAMPSON, OF GLAREMONT, NEW HAMPSHIRE.

PENDULUM-BALANCE.

Speccation of Letters Patent No. 6,852, dated November 6, 1849.

To all 107mm t may concern Be it known that I, ELNATHAN SAMrsoN, ofClaremont, in the county of Sullivan and State of New Hampshire, haveinvented certain new and useful Improvements in PendulumPlatform-Balances, and that the following is a full, clear, and exactdescription of the principle or character which distinguishes them fromall other things before known and of the usual manner of making,modifying, and using the same, reference being had to the accompanyingdrawings, which form a part of this specification, in which- Figure l,is a sectional elevation on line 0;-03 of Fig. 2, which latter is a planof the moving parts with the case platform &c in section. Fig. 3, is asection of the scale for light weights.

The nature of my improvements in pendulum platform balances, consists inthe mode of arranging the levers for the platform, and adapting thependulum bala-nce thereto, so as to weigh Aeither ounces or pounds withthe same index and scale; the parts are' constructed as follows-first, acastiron base (a, a,),' one end (65,) of which is square, and forms thefoundation for the platform for heavy weights; this is connected withthe other part by a hollow stem (CW), within which are portions of thelevers about. to be described; the other portion of the base, lettered(a,), forms the foot of a semicylindrical case (7),) which contains thewing (0,) that is on the axis, of the index (67,), and prevents thevibration thereof, as in the balance heretofore patented by me; the axis(6,) of the index is supported on knife edges, as is usual in suchapparatus; and near its center it has an eccentric, or cam-shapedlprojection (f,) affixed to it, over which a chain or cord (g,) passesdown and connects with the levers above named, on which the platformrests.

The hand, or index (d) is aflixed at the end of the axis, and has acounter balance the pan or wing (0,) which is a plain flat piece ofmetal, nearly filling the cross section of the semi- Theglevers on whichthe weighing platform rests, are two in number, and both of the 2dorder, the longest lever (z',) has a bow or loop at one end, stirrupshaped, with a long arm projecting from it, that extends under thecylinder to the center, thereof, and is there l connected with theshorter lever (70,) that is just above it; this last named lever (70,)has a cross head atits opposite end that runs across just within theopening over which the platform rests; the two ends of said lever reston triangular edged fulcra in rings (7,) suspended to t-he base, just infront of the fulcra are two horns parallel with them, on which two ofthe legs (n) rest; these horns are placed at the proportional distancebetween the fulcra, and the end of the lever under the case (7),) and anarm extends beyond the fulcra, on which there is an adjustable counterbalance (0,) to counter balance the platform-this weight (0,) is withinthe loop of the long lever on the extreme end of this loop are twoprojecting fulcra on each side, like those at the other lever; and at adistance therefrom, proportionally equal to the division of the shorterlever, I project a horn on each side at (m,) these support the two otherlegs of the platform, and by this arrangement it will be perceived thatboth levers move in the same direction, and the arc of motion of bothhorns is nearly equal, by which considerable friction is' avoided: theplatform is a plane surface, with four legs on its under side, resting,as before remarked, on the horns of the levers; when a weight is placedupon this platform, it causes the axis (6,) of the index to revolve inconsequence of the chain which connects them being passed over the cam;the index moves within a thin fan-shaped case (9,) the point only beingexposed, which passes over a segmental scale (13) on which the weightsare marked. On the extreme end of the upper lever (76,) the end of anupright rod (3,) rests, which extends up through a hole, at or near thecenter of the cover (b,) of the case (5,); this rod is 4 arranged inconnection With the levers of the platform scales as to have the sameindex indicate the Weight of articles placed on either the large orsmall balance; and lastly, I claim the arrangement of the plat-formlevers, both Working in one direction, with the adjustaple Weightappended thereto. ELNATHAN SAMPSON. Vitnesses:

J. J. GREENAUGH, WM. GREENAUoI-I.

